A freezing-proof system for a make-up pipe of circulating cooling water in cold regions

Abstract

The utility model discloses a kind of cold region circulating cooling water replenishing pipe anti-freezing systems, including circulating cooling water pool and replenishing pipe, further including control system, emptying water pipe, shut-off valve and emptying valve, replenishing pipe includes first replenishing pipe and second replenishing pipe, first replenishing pipe one end is used to connect with water pipeline, other end is connected with the water inlet of second replenishing pipe and emptying water pipe respectively through tee joint, the outer of first replenishing pipe's anti-freezing heat preservation section is laid with heat preservation layer, second replenishing pipe is close to the circulating cooling water pool, the water outlet of second replenishing pipe extends to the circulating cooling water pool, the end for connecting second replenishing pipe of first replenishing pipe is set shut-off valve, emptying water pipe is set emptying valve, the control system is electrically connected with shut-off valve and emptying valve respectively, for control shut-off valve, emptying valve start, stop.The utility model structure is simple, solve circulating cooling water replenishing pipe anti-freezing energy consumption is higher, operation difficulty is big and reduces artificial cost.

Description

Technical Field

[0001] This utility model belongs to the field of circulating water cooling technology, specifically relating to an antifreeze system for circulating cooling water makeup pipes in cold regions. Background Technology

[0002] In industrial production, circulating cooling water is required for heat exchange. During the operation of open cooling towers, the circulating cooling water will spill and evaporate, necessitating periodic water replenishment. Since cooling towers are typically installed outdoors, the water replenishment pipes of the circulating cooling water system require antifreeze and insulation measures during winter operation.

[0003] The following are some existing methods for preventing freezing of outdoor water supply pipes in cold regions:

[0004] 1. Installing an antifreeze insulation layer on the outside of the pipes and replacing it during the water freezing period, or slightly opening the faucet or opening the faucet periodically to prevent freezing, are all wasteful of water. Opening the faucet periodically is troublesome to operate manually, and requires a high level of experience depending on the temperature, making it difficult to operate.

[0005] 2. Electric heat tracing is used for insulation, but the initial investment and operating costs are relatively high.

[0006] 3. After each water replenishment, drain the remaining water from the water replenishment pipe. This method requires draining all the water from the water replenishment pipe each time, which is wasteful of water when the pipe diameter is large or the pipe is long.

[0007] All of the above methods have certain problems and cause serious energy waste. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing an antifreeze system for circulating cooling water supply pipes in cold regions. This system has a simple structure and solves the problems of high energy consumption, difficult operation, and reduced labor costs associated with antifreeze systems for circulating cooling water supply pipes.

[0009] The technical solution adopted to achieve the purpose of this utility model is:

[0010] A system for preventing freezing of circulating cooling water supply pipes in cold regions includes a circulating cooling water tank and a supply pipe, as well as a control system, a drain pipe, a shut-off valve, and a drain valve. The supply pipe includes a first supply pipe and a second supply pipe. One end of the first supply pipe is connected to a tap water pipe, and the other end is connected to the inlets of the second supply pipe and the drain pipe via a tee. The first supply pipe has an insulation layer on its antifreeze and heat-insulating section. The second supply pipe is located near the circulating cooling water tank, and its outlet extends into the circulating cooling water tank. The shut-off valve is installed at the end of the first supply pipe that connects to the second supply pipe, and the drain pipe is equipped with the drain valve. The control system is electrically connected to the shut-off valve and the drain valve, respectively, and is used to control the opening and closing of the shut-off valve and the drain valve.

[0011] Furthermore, the insulation layer laid outside the antifreeze and insulation section of the first water supply pipe is the insulation layer of the circulating cooling water pipe between the cooling tower and the heat exchanger in the circulating cooling system, and the antifreeze and insulation section of the first water supply pipe is bundled together with the circulating cooling water pipe.

[0012] Furthermore, the insulation layer is a 20-40mm thick antifreeze insulation layer.

[0013] Furthermore, it also includes a level gauge, which is installed in the circulating cooling water tank to monitor the water level information of the circulating cooling water tank and send it to the control system. The control system controls the shut-off valve and the vent valve respectively based on the received level gauge information.

[0014] Furthermore, the control system is a remote control system.

[0015] Furthermore, both the shut-off valve and the vent valve are solenoid valves.

[0016] Furthermore, the drain pipe is vertically downward.

[0017] Furthermore, the antifreeze and insulation section of the first water supply pipe is located outdoors.

[0018] The above technical solution has the following beneficial effects:

[0019] This utility model has a simple structure. It adds a drain pipe, dividing the water supply pipe into two sections: a first water supply pipe and a second water supply pipe. Since the first water supply pipe has an insulation layer laid outside its antifreeze insulation section, this layer effectively prevents ice formation in the antifreeze insulation section of the first water supply pipe during cold winters. The second water supply pipe is located near the circulating cooling water pool. The first water supply pipe is connected to the second water supply pipe and the drain pipe via a tee. A shut-off valve is installed on the first water supply pipe near the tee connection end, and a drain valve is installed on the drain pipe. When it is necessary to drain the water in the water supply pipe for antifreeze purposes, the through-hole controls the opening and closing of the shut-off valve and the drain valve. Antifreeze is achieved simply by opening the drain valve on the drain pipe and closing the shut-off valve to drain the remaining water in the second water supply pipe, minimizing the amount of water drained and saving costs. This utility model effectively prevents freezing, ensures stable circulating cooling water quality, and improves the overall operating efficiency of the system.

[0020] The insulation layer laid outside the antifreeze and insulation section of the first water supply pipe is the insulation layer of the circulating cooling water pipe section between the cooling tower and the heat exchanger in the circulating cooling system. The first water supply pipe is bundled together with the circulating cooling water pipe. The antifreeze and insulation section of the first water supply pipe is laid parallel to the circulating cooling water pipe and inside the circulating cooling water pipe's insulation layer, utilizing the waste heat of the circulating water system for antifreeze. The antifreeze and insulation section of the first water supply pipe extends to the circulating cooling water pool, reducing energy consumption.

[0021] It also includes a level gauge, which monitors the water level information of the circulating cooling water pool and sends it to the control system. The control system controls the shut-off valve and the vent valve respectively based on the received level gauge information, thereby realizing automated control and reducing labor costs.

[0022] The drain pipe is vertically downward, ensuring that any remaining water inside is completely drained.

[0023] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of specific embodiment 1.

[0025] In the attached diagram: 1 is the circulating cooling water pool, 2 is the first water supply pipe, 3 is the second water supply pipe, 4 is the drain pipe, 5 is the shut-off valve, 6 is the drain valve, and 7 is the insulation layer. Detailed Implementation Specific Implementation

[0027] See Figure 1As shown, a cold region circulating cooling water supply pipe antifreeze system includes a circulating cooling water tank 1, a supply pipe, a drain pipe 4, a control system, a shut-off valve 5, and a drain valve 6. The circulating cooling water tank 1 is provided with a supply water level and a maximum water level. The maximum water level of the circulating cooling water tank 1 is provided with an overflow port. When the supply water level is reached, water is supplied to the circulating cooling water tank 1. The water supply pipe includes a first water supply pipe 2 and a second water supply pipe 3. In this specific embodiment, both the first water supply pipe 2 and the second water supply pipe 3 are DN80 pipes. The second water supply pipe 3 is located near the circulating cooling water pool 1 and is arranged vertically along the circulating cooling water pool 1. The outlet of the second water supply pipe 3 extends to the circulating cooling water pool 1. One end of the first water supply pipe 2 is used to connect to the tap water pipe, and the other end of the first water supply pipe 2 is connected to the inlet of the second water supply pipe 3 and the inlet of the drain pipe 4 through a tee. The first water supply pipe 2 includes an outdoor section and an indoor section. The outdoor section of the first water supply pipe 2 is an antifreeze and heat-insulating section. An insulation layer 7 is laid on the outside of the antifreeze and heat-insulating section of the first water supply pipe 2. The thickness of the insulation layer is 20-40mm. In this specific embodiment, the thickness of the insulation layer is 30mm. The antifreeze and heat-insulating layer uses existing heat-insulating and antifreeze materials.

[0028] The drain pipe 4 is vertically downward, short, and its diameter is smaller than that of the water supply pipe. It only serves to drain water, ensuring that the water supply in the second water supply pipe 3 can be emptied by being vertically downward. In this specific embodiment, the drain pipe is a DN25 pipe.

[0029] The shut-off valve 5 is installed at the end of the first water supply pipe 2 that connects to the second water supply pipe 3, and the vent pipe 4 is equipped with the vent valve 6. Both the shut-off valve 5 and the vent valve 6 are solenoid valves. The control system is an existing PLC controller, which is electrically connected to both the shut-off valve and the vent valve to control their opening and closing respectively. Alternatively, the control system can be a remote control system, allowing for remote control of the shut-off valve and the vent valve.

[0030] In this specific embodiment: the insulation layer laid outside the antifreeze and insulation section of the first water supply pipe is the insulation layer of the circulating cooling water pipe between the cooling tower and the heat exchanger in the circulating cooling system. The antifreeze and insulation section of the first water supply pipe is bundled together with the circulating cooling water pipe. The bundling method can be the existing water pipe bundling method. The first water supply pipe can be a rubber hose or a metal pipe. Using a metal pipe has a better heat conduction effect. The heat temperature of the circulating cooling water pipe is used to insulate the first water supply pipe, which saves energy.

[0031] The working principle of this utility model;

[0032] During winter, when no water replenishment is needed: shut-off valve closed, vent valve open;

[0033] Winter water replenishment: When the liquid level in the circulating cooling water tank is lower than the water replenishment level, the vent valve is closed, and after a 5-second delay after the vent valve is closed, the first water replenishment pipe shut-off valve is opened to replenish water.

[0034] After winter water replenishment is completed: When the liquid level in the circulating cooling water tank rises to the highest level, the shut-off valve of the first water replenishment pipe is closed, the venting valve is opened and maintained in this state until the next water replenishment, which is used to drain the residual water at the end of the second water replenishment pipe after water replenishment.

[0035] In other seasons: The vent valve is closed. The shut-off valve opens or closes according to the water level. When the liquid level in the circulating cooling water tank is lower than the water level, the shut-off valve opens. When the liquid level in the circulating cooling water tank rises to the highest level, the shut-off valve of the first water supply pipe closes. Note: In other seasons where freezing is unlikely, normal water supply is used, and it is not necessary to vent the residual water at the end. Specific Implementation

[0036] The features of this specific embodiment include: a level gauge installed in the circulating cooling water tank; the level gauge is signal-connected to the control system; the connection between the level gauge and the control system uses an existing method, therefore this is omitted here. The level gauge monitors the water level information of the circulating cooling water tank and sends it to the control system; the control system, based on the received level gauge information, controls the opening and closing of the shut-off valve and the vent valve, respectively. Other features are the same as in specific embodiment 1, therefore this is omitted here.

Claims

1. A system for preventing freezing of circulating cooling water supply pipes in cold regions, comprising a circulating cooling water tank and a supply pipe, characterized in that: It also includes a control system, a drain pipe, a shut-off valve, and a vent valve. The water supply pipe includes a first water supply pipe and a second water supply pipe. One end of the first water supply pipe is connected to a tap water pipe, and the other end is connected to the inlet of the second water supply pipe and the drain pipe respectively via a tee. The antifreeze and heat-insulating section of the first water supply pipe is covered with an insulation layer. The second water supply pipe is close to the circulating cooling water pool, and the outlet of the second water supply pipe extends to the circulating cooling water pool. The shut-off valve is installed at the end of the first water supply pipe that is connected to the second water supply pipe. The drain pipe is equipped with the vent valve. The control system is electrically connected to the shut-off valve and the vent valve respectively, and is used to control the opening and closing of the shut-off valve and the vent valve.

2. The antifreeze system for circulating cooling water makeup pipes in cold regions according to claim 1, characterized in that: The insulation layer laid outside the antifreeze and insulation section of the first water supply pipe is the insulation layer of the circulating cooling water pipe between the cooling tower and the heat exchanger in the circulating cooling system, and the antifreeze and insulation section of the first water supply pipe is tied together with the circulating cooling water pipe.

3. A cold-region circulating cooling water makeup pipe antifreeze system according to claim 1 or 2, characterized in that: The insulation layer is a frost-resistant insulation layer with a thickness of 20-40 mm.

4. The antifreeze system for circulating cooling water makeup pipes in cold regions according to claim 1, characterized in that: It also includes a level gauge, which is installed in the circulating cooling water tank. The level gauge is connected to the control system for monitoring the water level information of the circulating cooling water tank and sending it to the control system. The control system controls the shut-off valve and the vent valve respectively based on the received level gauge information.

5. A cold-region circulating cooling water makeup pipe antifreeze system according to claim 1 or 4, characterized in that: The control system is a remote control system.

6. The antifreeze system for circulating cooling water makeup pipes in cold regions according to claim 1, characterized in that: Both the shut-off valve and the vent valve are solenoid valves.

7. The antifreeze system for circulating cooling water makeup pipes in cold regions according to claim 1, characterized in that: The drain pipe is vertically downward.

8. The antifreeze system for circulating cooling water makeup pipes in cold regions according to claim 1, characterized in that: The antifreeze and insulation section of the first water supply pipe is located outdoors.

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